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(No Model.)

E. C1 FASOLDT.v

GOMPOUND AIR GOMPRESSING PUMP.

n Patented July 10, 1888. g Q 8 No. 385 85s.

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ERNEST O. FASOLDT, OF ALBANY, NEV YORK, ASSGNOR OF ONE-HALF TO EZRA XV. SMITH, OE SAME PLACE.

COMPOUND AIR=COMPRESSENG PUMP.

SPECIFICATION forming part of Letters Patent No. 385,853, dated July 10, 1888.

Application filed April 9, 1888.

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Be it known that I, ERNEST O. FASOLDT, of the city and county of Albany, in the State of New York, have invented new and useful Improvements in Compound Air-Oompressing Pumps, of which the following is a specilication.

My invention relates to improvements in air-compressing pumps; and the object of my invention is to provide a simple and effective air-compressing pump wherein the air will be compressed to a high degree by each reciprocation of themovable parts. rlhis object lattain by the mechanism illustrated in the accompanying drawings, which are herein referred to and form part of this specification, and in which- Figure lis aside elevation of my ail-pump. Fig. 2 is a vertical section of the movable cylinder of my pump, showing the inner cylinder in elevation. Fig. 3 is a central vertical seetion ofthe movable and inner cylinders when the parts are at the highest point of their movement. Fig. 4 is a like section showingthe parts in an intermediate position during an upward movement of the movable cylinder, and Fig. 5 is a horizontal section at the line X X of Fig. 3.

As represented in the drawings, A is the inner cylinder, which is held in astationary position, and is provided at its upper end with a piston, B, which is fitted snugly to the bore of the movable Acylinder of my airpump. Said piston is provided with an upwardlyopening inlet-valve, l, which closes the opening through which air is admitted into the interior of the movable cylinder, a downwardlyopening valve, 2, which closes the opening through which the air passes from the movable cylinder into the inner cylinder, A, and an upwardly-opening valve, 3, which closes the discharge-opening from said inner cylinder. Said dischargeopening leads intoa passage, 4, from which a discharge-pipe, 5, extends to the exterior of the apparatus, so that a flexible or other suitable tube may be attached thereto to convey the compressed ai r to any desired point of delivery.

C is the movable cylinder, which is provided with a cross-handle, G, or other means for giv- Serial No. 270,043. (No model.)

ing a reciprocating movement to it. The bore of said cylinder is adapted to form an air tight joint with the perimeter of the piston B, on which said cylinder is fitted to slide up and down. rlhe upper end of said cylinder is closed by a head, D, from the center of which depends a rod, 7, which passes through a stuffing-box, 8, that is formed on the upper side of the piston B, whereby provision is made to permit said rod to reciprocate through the center ol`- said pistomwhile an air-tight joint is maintained around the rod. On the lower end of the rod 7 is a smaller piston, E, which lits the bore ofthe inner cylinder, A, sufficiently close to form an air-tight joint therewith.

'lhe operation of my compound aircoln` pressing pump is as follows: In moving the cylinder Oand its attached pistou E upwardly, as indicated by the outer arrow ou Fig. 4, the air enters said cylinder' by the inlet air-opening, that is governed by the valve l. Simultaneously therewith the air which is contained in the inner cylinder, A, and which has recei ved its primary compression by being forced into said inner cylinder by a downward movement of the cylinder C, is forced out of said .inner cylinder through the dischargeopening, that is governed by the valve 3, and from thence is conveyed through the discharge-pipe 5 and its connections to the required point of delivery. On reversing the direction of movement of the cylinder O the air that is contained in said cylinder is compressed and forced to pass through the opening governed bythe valve 2 into the cylinder A, the valves 1 and 3 closing instantly on a reversal of the movement of the cylinder C, to prevent the air from escaping through the openings which are governed by said valves. The direction of movement of the air during the upward stroke of the cylinder' C is indicated by the full ar rows on Eig. et, and the movement of the air during the downward stroke of said cylinder is indicated by the dotted arrows 0n the same figure. It will be seen that the primary compression ol' the air is produced by forcing the volume of air contained in the larger cylinder, C, into the small inner cylinder, A, and a second compression of said air is produced by forcing the air out of the latter cylinder.

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air-openings, and said movable cylinder being provided with a piston-head which is fitted to ro p the bore of the stationary cylinder, as and for the purpose herein speeied.

ERNEST O. FASOLDT.

Witnesses:

WM. H. LOW, S. B. BREWER. 

